Burak Kaan Köse
90 lines
3.0 KiB
C#
90 lines
3.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Windows.Input;
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using CommunityToolkit.WinUI;
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using Microsoft.UI.Xaml.Controls;
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using Wino.Mail.ViewModels.Data;
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namespace Wino.Mail.WinUI.Controls.Advanced;
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[Obsolete("ItemsView sucks. Hard to deal with virtualization issues. Use ListView. This control is here to wise up anyone who tries to use it.")]
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public partial class WinoItemsView : ItemsView
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{
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private const string PART_ScrollView = nameof(PART_ScrollView);
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private ScrollView? _internalScrollView;
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[GeneratedDependencyProperty]
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public partial ICommand LoadMoreCommand { get; set; }
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public IEnumerable<object>? CastedItemsSource => ItemsSource as IEnumerable<object>;
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public WinoItemsView()
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{
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DefaultStyleKey = typeof(ItemsView);
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}
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protected override void OnApplyTemplate()
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{
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base.OnApplyTemplate();
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_internalScrollView = GetTemplateChild("PART_ScrollView") as ScrollView ?? throw new System.Exception("Can't find the ScrollView in WinoItemsView.");
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_internalScrollView.ViewChanged -= InternalScrollViewPositionChanged;
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_internalScrollView.ViewChanged += InternalScrollViewPositionChanged;
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}
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private void InternalScrollViewPositionChanged(ScrollView sender, object args)
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{
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if (_internalScrollView == null) return;
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// No need to raise init request if there are no items in the list.
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if (ItemsSource == null) return;
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double progress = sender.VerticalOffset / sender.ScrollableHeight;
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// Trigger when scrolled past 90% of total height
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if (progress >= 0.9) LoadMoreCommand?.Execute(null);
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}
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public bool SelectMailItemContainer(MailItemViewModel mailItemViewModel)
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{
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return true;
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}
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/// <summary>
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/// Recursively clears all selections except the given mail.
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/// </summary>
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/// <param name="exceptViewModel">Exceptional mail item to be not unselected.</param>
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/// <param name="preserveThreadExpanding">Whether expansion states of thread containers should stay as it is or not.</param>
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public void ClearSelections(MailItemViewModel? exceptViewModel = null, bool preserveThreadExpanding = false)
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{
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if (CastedItemsSource == null) return;
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foreach (var item in CastedItemsSource)
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{
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if (item is MailItemViewModel mailItemViewModel)
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{
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if (mailItemViewModel != exceptViewModel)
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{
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mailItemViewModel.IsSelected = false;
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}
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}
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else if (item is ThreadMailItemViewModel threadMailItemViewModel)
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{
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threadMailItemViewModel.IsSelected = false;
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if (!preserveThreadExpanding) threadMailItemViewModel.IsThreadExpanded = false;
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foreach (var childMail in threadMailItemViewModel.ThreadEmails)
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{
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if (childMail != exceptViewModel)
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{
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childMail.IsSelected = false;
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}
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}
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}
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}
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}
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}
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